Add mac-syphon plugin

Fix pulse audio format conversion

Fix small bug in timestamp smoothing for audio sources

Due to a small error in the timestamp smoothing code the timestamp of
audio packages that were too early was always set to the next expected
timestamp, even if the difference was bigger than the smoothing threshold.

This would cause obs to simply append all audio data to the buffer even if
the real timestamp was way smaller than the next that was expected.

This should reduce corruption problems with for example the pulseaudio
plugin, which resends data under certain conditions.

If the sample format used by PulseAudio can not be converted into an
OBS audio format it will be handled as AUDIO_FORMAT_UNKNOWN which will
not result in a proper audio recording. So instead we request a format
that OBS supports from PulseAudio and let it do the format conversion.

The format PA_SAMPLE_S24_32LE is a 24 bit audio format in 32 bit integers
and not a 32 bit audio format and so it should no be mapped to
AUDIO_FORMAT_32BIT.

Before it was giving timestamps based upon system time for each new
segment of audio data.  Also, it was subtracting pulse latency from the
audio timestamp, which seems like it was really meant for use with the
pulse audio time rather than system time.

Now, it just uses system time for timestamps.  Still might not be
totally perfect, but seems to be much better than it was.

This also removes the latency calculation.  Latency is no longer used
because we're not using pulseaudio timing.

Fix crash in obs_get_video_info when video_output_get_info returns NULL

As stated in the sysinfo manpage the totalram field in the sysinfo
structure is in mem_unit sizes since Linux 2.3.23. To get the actual
memory in the system the totalram value has to be multiplied with the
mem_unit size.

Fixes log_windows_version logging garbage for build when running with
debug heap enabled (assuming osvi.szCSDVersion is an empty string)

Allows adding Syphon servers as sources, and provides game-capture if
used with SyphonInject (specifically the scripting additions have to be
installed for SyphonInject to work from within OBS)

I do not want the D3D11 library to depend on a specific compiler
version.  This way, I do not have to distribute D3D Compiler libraries
with the program (proprietary binary blobs).  Any particular version
works because the API for the D3DCompiler function appears to be the
same; the only things that change are other features and additions
mostly (at least as far as I can tell).  Using any version available on
the system should be more than sufficient rather than depending on some
specific D3D compiler version.

If the user doesn't have it, a download of the latest D3D distributables
should be fine, though it should work with the ones that come with
windows 7+ as well.

This provides a default effect for users of GL_TEXTURE_RECTANGLE/textures
that return true for gs_texture_is_rect

obs_source_update_properties should be called by sources when property
values change, e.g. a capture device source would use this when it
detects a new capture device (in case its properties contain a list of
available capture devices or similar)

This allows for easier comparison between two obs_data_t and it will make

const char *json1 = obs_data_get_json(data);
obs_data_t *data_ = obs_data_create_from_json(json1);
const char *json2 = obs_data_get_json(data_);

produce the same string in json1 and json2

Now using components instead of one find_package call per module

This Fixes a minor flaw with the API where data had to always be mutable
to be usable by the API.

Functions that do not modify the fundamental underlying data of a
structure should be marked as constant, both for safety and to signify
that the parameter is input only and will not be modified by the
function using it.

Fixed NULL pointer dereferencing in linked lists

Remove type pointers

Typedef pointers are unsafe.  If you do:
typedef struct bla *bla_t;
then you cannot use it as a constant, such as: const bla_t, because
that constant will be to the pointer itself rather than to the
underlying data.  I admit this was a fundamental mistake that must
be corrected.

All typedefs that were pointer types will now have their pointers
removed from the type itself, and the pointers will be used when they
are actually used as variables/parameters/returns instead.

This does not break ABI though, which is pretty nice.

It's better to use VBR for local recordings, so this option should be
nice for people who want to do that.